Wire Size Temporary Installation

[mivey]

iwire,

How do you keep people out of the secondary cabinet? What is done about the back-fed primary side of the xfmr and the metering equipment?

 

[ultramegabob]

I always thought these temporary installs had to us more tuffer type of cable when ran like this. Is this just the same type of 4/0 cable you would use if you were putting in perminant installs in conduit??

I made the terminations for a news broadcast van at a highschool a couple of times, the cable belonged to the broadcast company, the school had a fused diconnect just for them, all I had to do was run the cable through some strain reliefs and land it under the lugs, it was alot like welding cable.

 

[iwire]

iwire,

How do you keep people out of the secondary cabinet? What is done about the back-fed primary side of the xfmr and the metering equipment?

In the pictures above showing 'pad mount' transformers they where in a utility company owned vault.

The top of the transformers where removed when the permanent conductors where installed, all we did was swing open the door to hook up our temporary cables.

I was not on that job but I can assume the utility pulled the elbows off the high voltage side of the transformers before the guys back fed it.

 

[zbang]

Because of note 1 that applies the column D ampacities. It appears to me that the individual conductors are in contact with each other for more than 24" in many places in the picture.

I have some Carol type SC 1g that's marked ""NEC 400-5(b) for 90degC outdoor". Assuming that the 4/0 is similarly marked, this would put 4/0 at 405a. Some people will also argue that the conductors are effectively unbundled, and thus in "free air". But I won't :grin:. I will also dodge the question of derating.

 

[don_resqcapt19]

I have some Carol type SC 1g that's marked ""NEC 400-5(b) for 90degC outdoor". Assuming that the 4/0 is similarly marked, this would put 4/0 at 405a. Some people will also argue that the conductors are effectively unbundled, and thus in "free air". But I won't :grin:. I will also dodge the question of derating.

I don't know of any equipment that will let you use the 90?C rating, except for the purpose of derating.

 

[LarryFine]

I will also dodge the question of derating.

Ah. The Artful Dodger.

 

[brian john]

We do this all the time, once did 21 cables 4/0 360' one way distance, wears me out. We were using 100 footers but now utilize 50 footers.

 

[frenchelectrican]

I done quite few temp runs as well but the biggest challange is stupid 4160 and 7200 volts cable they are pretty tricky to termated it ughhh.

but for most of the cable they are not too bad for me.

And yeah I get up middle of nite to make a run with it.

Merci,Marc

 

[iwire]

We do this all the time, once did 21 cables 4/0 360' one way distance, wears me out.

It does beat you up, especially the breakdown and roll up of all the cables.

 

[don_resqcapt19]

It does beat you up, especially the breakdown and roll up of all the cables.

Given the price of copper now, unless you hire an armed guard, you won't have any pick up to do:smile:

 

[brian john]

Don:

That is a major concern espically with temp generators. We make the customer accept responsibility for all cables left on site.

 

[zbang]

Given the price of copper now, unless you hire an armed guard, you won't have any pick up to do:smile:

Well, ya. Had someone try to steal a neutral once. While it was "in-use". Fortunately, no one was hurt and nothing damaged.

BTW, for roll-up, I've had decent luck jobbing in college theater tech students; it gets the work done, and gives them a taste of the Real World.

 

[iwire]

Given the price of copper now, unless you hire an armed guard, you won't have any pick up to do:smile:

:grin:


Yeah, I hear that, luckily we are not responsible for the cables. We did a job in the city and we had pallet / bins filled with 50' 4/0 cables. I could not belive they where still there the next day.

 

[brian john]

Bob:

What's that address again?